Use PrintF instead of fprintf.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1122 matching lines @@
     // current frame is the top-level frame.
     it.Advance();
     Handle<Object> is_top_level = it.done()
         ? factory()->true_value()
         : factory()->false_value();
     // Generate and print stack trace line.
     Handle<String> line =
         Execution::GetStackTraceLine(recv, fun, pos_obj, is_top_level);
     if (line->length() > 0) {
       line->PrintOn(out);
-      fprintf(out, "\n");
+      PrintF(out, "\n");
     }
   }
 }
 
 
 void Isolate::ComputeLocation(MessageLocation* target) {
   *target = MessageLocation(Handle<Script>(heap_.empty_script()), -1, -1);
   StackTraceFrameIterator it(this);
   if (!it.done()) {
     JavaScriptFrame* frame = it.frame();
@@ skipping 145 matching lines @@
       }
 
       // If the abort-on-uncaught-exception flag is specified, abort on any
       // exception not caught by JavaScript, even when an external handler is
       // present.  This flag is intended for use by JavaScript developers, so
       // print a user-friendly stack trace (not an internal one).
       if (fatal_exception_depth == 0 &&
           FLAG_abort_on_uncaught_exception &&
           (report_exception || can_be_caught_externally)) {
         fatal_exception_depth++;
-        fprintf(stderr, "%s\n\nFROM\n",
-          *MessageHandler::GetLocalizedMessage(this, message_obj));
+        PrintF(stderr,
+               "%s\n\nFROM\n",
+               *MessageHandler::GetLocalizedMessage(this, message_obj));
         PrintCurrentStackTrace(stderr);
         OS::Abort();
       }
     } else if (location != NULL && !location->script().is_null()) {
       // We are bootstrapping and caught an error where the location is set
       // and we have a script for the location.
       // In this case we could have an extension (or an internal error
       // somewhere) and we print out the line number at which the error occured
       // to the console for easier debugging.
       int line_number = GetScriptLineNumberSafe(location->script(),
@@ skipping 1085 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal